neovim/src, branch master

fix(channel): stack-buffer-overflow with exit during connection (#39387)

2026-04-25T12:07:22Z

Problem: When Nvim exits while connecting to a socket it leads to stack-buffer-overflow. Solution: Associate the handle with the Stream and use the Stream's internal_close_cb to update the "closed" status.

fix(build): add `_core/time.lua` to gettext #39384

2026-04-25T09:24:43Z

feat(tui): restore 'ttyfast' to control tty requests #38699

2026-04-24T18:45:20Z

Problem: When running nvim on a remote machine over SSH, if there is high ping, then bg detection may not complete in time. This results in a warning every time nvim is started. #38648 Solution: Restore 'ttyfast' option and allow it to control whether or not bg detection is performed. Because this is during startup and before any user config or commands, we use the environment variable `NVIM_NOTTYFAST` to allow disabling `ttyfast` during initialization.

fix(api): leak preview callback LuaRef in nvim_create_user_command #39357

2026-04-24T18:13:24Z

Problem: Invalid `nvim_create_user_command` calls can leak the `preview` callback reference after Neovim has taken ownership of it. 1. build with {a,l}san 2. run: ```sh --headless -u NONE --clean +'lua for i = 1, 100 do pcall(vim.api.nvim_create_user_command, "some very epic stuff" .. i, {}, -- NOTE: this is INVALID (not a function or string) { preview = function() end }) end vim.cmd("qa!") ' +qa ``` 3. see: ``` 100 lua references were leaked! ``` Solution: Clear `preview_luaref` in `err:`.

fix(api): LuaRef leak in nvim_set_keymap on LHS too long (>=66 bytes) #39351

2026-04-24T18:10:28Z

Problem: `nvim_set_keymap` leaks the `callback` `LuaRef` when the LHS is too long. Solution: Make `set_maparg_lhs_rhs` transfer `rhs_lua` to `MapArguments` up front so the caller always owns the ref.

fix(path): normalize path slashes on Windows #37729

2026-04-24T17:20:25Z

Problem: On Windows, path separators may become inconsistent for various reasons, which makes normalization quite painful. Solution: Normalize paths to `/` at the entry boundaries and always use it internally, converting back only in rare cases where `\` is really needed (e.g. cmd.exe/bat scripts?). This is the first commit in a series of incremental steps. Note: * some funcs won't respect shellslash. e.g. `expand/fnamemodify` * some funcs still respect shellslash, but will be updated in a follow PR. e.g. `ex_pwd/f_chdir/f_getcwd` * uv's built-in funcs always return `\`. e.g. `uv.cwd/uv.exepath` Co-authored-by: Justin M. Keyes

feat(api): nvim_echo(percent=nil) means "unknown" progress #39029

2026-04-24T15:57:35Z

Problem: No way to signal "unknown" or "indeterminate" progress percentage. Solution: Treat percent=nil as "indeterminate" percent.

fix(options): repair stale UI state after `:set all&` #39026

2026-04-23T22:37:59Z

Problem: `set all&` resets option values directly and leaves UI-derived state stale for `guicursor`, `laststatus`, and `showtabline`. Solution: Repair some of the stale UI state in the bulk reset path by reparsing `guicursor`, refreshing statusline state, and recomputing tabline/window rows.

feat(excmd): add :uptime command #39331

2026-04-23T21:11:59Z

Problem Nvim marks its v:starttime, but there is no user-friendly way to get Nvim's uptime. Solution Add :uptime (based loosely on uptime(1)).

fix(lua): don't strip debuginfo in precompile module #39191

2026-04-23T16:42:41Z

Problem: debug.getinfo on bytecode module/func don't give you detail source info. Solution: - Use `loadstring`+`string.dump` to replace LUAC_PRG(`luac`/`luajit -b`) - `string.dump(…,false)` to generate non-strip version bytecode - `loadstring(…,fname)` to specify the full source name BEFORE: $ nvim --clean +'=debug.getinfo(vim.fn.maparg("]", "n", 0, 1).callback, "Sl")' --headless +q { currentline = -1, lastlinedefined = 456, linedefined = 452, short_src = "?", source = "=?", what = "Lua" } AFTER: $ nvim --clean +'=debug.getinfo(vim.fn.maparg("]", "n", 0, 1).callback, "Sl")' --headless +q { currentline = -1, lastlinedefined = 456, linedefined = 452, short_src = "/home/xx/b/neovim/runtime/lua/vim/_core/defaults.lua", source = "@/home/xx/b/neovim/runtime/lua/vim/_core/defaults.lua", what = "Lua" }